Spark-plug



L. F. LANDA.

SPARK PLUG.

APPLICAHUN mm SEPT x3, l9l8- 1,340,232. Pawnwd May 18,1920.

' 5 nvmtoz Lam's F Lm 351 his auopneqs UNITED STATES PATENT OFFICE.

LOUIS F. LANDA, OF FLUSHING. NEW YORK TO WILLIAM F. SCHMALKUCHE, JR., BOTH OF I. SGHMALKUCHE AND ONE-FOURTH nusnmmnnw YORK.

To all whom; a: rri-ay fconccra'? Beit knoivfi'tliatf I. Lows F: Lanna, a. citizen. of the United stsg a residing at F lu'shing', L'. llyin thecount'y of Queens and State-of Newfll'orlnhave invented certain new and u'e'iiiif rqveinents in Spark- Plugs; of wliichthe allowing is a specification,,such as yi ill enable those skilled in the art to' whiclil it'appertains to make and use the samdt f j This nvent on relates to what are known as spark plugs used in connection with m \tern'al combustion engines. and the object of l-lie'invention is to simplify the construction of 'devices of this class by forming the metallic body portion thereof of two approximately similar parts joined longitudinally of said bodyi aj further object being to provide a core for devices of the class specified which is composed of fireproof and waterproofmaterial and which is (placed between the separate parts of the b0 portion and held therebetween by the means for securing the separate parts of said body portion together: and'withjthes'e' iind other objects in view the invention consists in a device of the class and forthe purpose specified. constructed and operating .as hereinafter described and claimed.

The invention is fully disclosed in the following specification. of whichthe accompanying drawing forms a part.- in which the separate parts of my improvement are designated by suitable reference characters in each of the views. and in which Figure 1 is a side view of my complete spark plug shown in position for use:

Fig. 2 a section on the line 2-2 of Fig. 1

Fig. 3a bottom. plan view of the plug as shown in, Figs. 1 and 2;.

Fig. 4 an inside view of one of the metallic body parts detached;

Fig. 5 a detail view of the core portion of the plug with part of the construction broken away and in section;

Fig. 6 a detail sectional view of the core V of the plug but showing a modification and,

Fig. 7 a view similar to Fig. 3 but with part of the construction broken away and in section and showing the modification shown in Fig. 6.

In the practice of my invention. as shown in Figs. 1 to 5 inclusive. I provide a spark plug having a metallic body 10. composed Specification of Letters Patent.

"'afliiii' iiori filed September 13, 1918.

is; r n

. ASSIGNOR O F ONEFOURTH T0 WILLIAM SPARK-PLUG.

Patented May 18, 1920.

Serial No. 253,870.

of two approximately similar parts joined central];' and longitudinallly by pins and recesses as shown at 11 in *ig. 4, and said body comprises a top conical portion 12 at the base of which is an annular portion 13 below which is a hexagon shank 14 joined with an externally threaded and reduced sleeve 15 by a beveled portion 16. Each of the parts of the body'lO are provided with top and bottom bores 17 and 18 joined by an enlarged cylindrical bore 19, as shown in Fig. 4. and these bores are adapted to receive the core 20 shown in detail in Fig. 5.

The core 20 is preferably composed of a. composition having asbestos as a base, which produces a fireproof as well as waterproof core. and the composition employed and method of making such core is described and claimed in a co-pending application filed of equal date herewith. Another advantage of constructing thev having asbestos breakable core stand a greater strain lain or other similar material employed for this purpose.

The core 20 consists of an enlarged cylindrical body 21 at the top of which is a reduced neck 22 having an enlarged semispherical cap 23 at the top of which is a shank 24. having an angular cross head 25. At the bottom of the enlarged cylindrical portion 21 is a rounded tip or projection 26, and when the core 20 is separate parts-of the body portion 10 of the plug. the enlarged portion 21 fits within the enlarged cylindrical bores 19 and the reduced neck 22 fits in the bores 17, while the tip or projection 26 extends downwardly into the bores 18 as clearly illustrated in Fig. 2 of the drawing. in which figure it will be noted that the semi-spherical head 23 rests upon the top face 27 of the'separate parts of the body portion 10 and an annular convex portion 28 is'provided in the core 20 at the top of the neck22 as clearly shown in Figs. 2 and 5 of the drawing. into which cement may flow in sealing the separate parts of the plug together. as hereinafter set out.

A heavy wire 29 is secured centrally of the core 20 or embedded therein in the process of-molding the same. and said wire is held against movement in said core by a as a base produces a noncore 20 of a compositionplaced between the plurality of twists or bends 30 therein, au'.l v the upper end' of the wire 29 1s provided with a cross head 31 mounted in a transverse a rture 32 in the angular cross head 25,'an in connection with which'the ends 33 of a spring contact device 34 operate as shown in Fig. lto transmit the current from the magneto to the wire 29. The lower end of the wire 29 is extended through the tip 26 of the core and bent into hookshaped form as shown at 35, and the free end 36 thereof is adapted to cooperate with a contact pin 37 secured in the wall of the bore 18in radial alinement with the end 36 of the wire 29 andthis construction forms the spark gap or the plug. In connecting the separate parts of the plug prior to using the'same, the core 20 with the wire 29 therein is provided with a 20, coating .of liquid or plastic asbestos. this coating being applied principally upon the neck 22 and enlarged portion 21 of said core,

' after which the same is placed within one of the separate arts of the body portion 10, after which-t e other of said body parts is placed upon said core and the first named body part,-. after which a suitable packing and lock rin 38 is passed over the reduced 'and threa'de sleeve portion 15 upwardly onto the beveled portion 16 of the separate parts of the-bodyportion 10 to lock said parts together. By subjecting the plug connected in the manner above set out gradually to a predetermined degree of heat, the

core will be permanently cemented within the se' arate parts of the body portion, and

it wil be understood that said asbestos cement may also. be applied to the abutting faces of the separate parts of the body por- 40 tion 10 which will permanently secure the separate parts of the plug together. or until said parts are separated by force.

With a. plug constructed in the manner above set out therewill be no need for repair, or replacement unless the wire 29, or the hook-shaped'end 35 thereof, should be broken ofl by accident, or otherwise, in

which event-a new core may be substituted .for the old one. but unless damage is made to the wire 29 there will be little chance of other breakage due to the strength of the core 20 when constructed of an asbestos composition. It will also be noted that I provide a spark plug which is composed of four parts, namely, two body portions, :1 core and means for locking the separate parts of the body portions together.

' In Figs. 6 and 7, of the drawing, I have shown a, slight modification which consists fiilin embedding within the core 20 an annular contact wire 39 which is'adapted to make contact with the walls of the enlarged cylindrical bore 19. a The contact wire 39 is provided with inwardly directed portions 40 65 having downwardly directed extensions 41 wardly as shown-at 44, instea 'hooR-shapedjm .form as shown at 35, and

joined by a cross head 42, which is slightly curved cent-rally thereof as shown at 43 in Fig. 7, and the protruding ends of the wire 29 j'njth'e core 20 extends strai ht downof being whichcnijperates with-The curred portion 43 of the cross head'42. f I

\Vith the construction showhjp 6 and T the spark circuit of the lug, orjth' g jump or cross over thereof is al contained within the core. and this wouldbe ofiad' vantage in the event of the breakingI of w ich either of the circuit conducting wires would merely mean the replacement of a new core, while the construction shown in Figs. 1 to 5 inclusive, it would mean the replacement of a new core oia new bodyportion. While I have shown certain-details of construction for carrying my invention into effect and have stated that the core, 20 is preferably composed of a composition containing asbestos as a basis, it will be understood that my invention is not limited to hese details of construction, and yarious cl'ianges therein and modifications thereof may be made, within the scope of the a pended claims, without departing from t e spirit of my invention or sacrificing its advantages.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A spark plug comprising a body portion, means for retaining a core within the body portion, said corebeingcomposed of a non-.breal able fireproof andwaterproof ma-- terial having asbestosas a base, a circuit wire embedded in said core, one end of said .circuit wire being provided with a cross head, a spring contact detachably connected with the core and cooperating with said cross head and the other end of said wire protruding through the core and cooperate ing with the body portion through a suitablecircuit carrying element.

2. A spark plug comprising a body portion composed of two approximately similar are provided with a plurality of recesses, a core mounted in the recesses of the body portion. means for holding theseparate parts, the inner or abutting faces of which a parts of the body portion together to retain 1 the core therein, saidcore being composed of a material having asbestos as a base, a wire mounted in said core against displacement, one end of said wire protruding through the core and cooperating with the body portion through a circuit on ing element, and a tensional contact device cooperating with the other endof said wire.

. 3. A spark plug comprising a body portion com osed of two approximately similar parts,w ich when jdined together form a. conical head, a hexagon. shank and a. re=

duoe'd externally threaded sleeve, the abuttin faces of the body portion being recessed to orm top and bottom bores, and a central enlarged annular bore, a'core comprising an enlarged annular portion adapted to fit in the enlarged annular bore, said core being provided with an upwardly directed reduced neck and a downwardly directed tip which'fits in the upper and lower bores of the body portion respectively. a semi-spherL cal cap at the top of the neck of the core above which is a reduced neck ha ving a cross head, a wire embedded in the core and extending from the cross head downwardly and through the tip end thereof, a tensional contact device detachably connected with the cross head of the core and adapted to make contact with the upper end of said wire and the protruding end of said wire being ada ted to cooperate with a cireiiit carrying e ement in the body portion.

4. Aspark plug comprising a body portion divided centrally and longitudinally into two similarly formed and detachably connected parts, the abutting facts of which are provided with recesses which when the separate parts of the plug are placed together form a chamber the central portion of which is enlarged, the separate parts of the plug when placed together forming a central external angular portion, an externally threaded portion and a head portion,

a one-piece (ore adapted to be contained in the chamber formed in said parts, and a ring member adapted to be passed over said externally threaded portion for holding the separate parts of the bod portion together to retain the coretherein.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 11th day of Sept 1918.

' F. IhkNDAL.

Witnesses C. E. MULRBANY, H. E. THOMPSON. 

